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High-compaction-density lithium iron phosphate anode material and preparation method thereof

A lithium iron phosphate and cathode material technology, applied in the field of lithium ion batteries, can solve the problems of restricting battery energy density, poor product batch stability, complex manufacturing process, etc., to meet production cost control and automated production, and simplify production process flow , The effect of finished product is good

Inactive Publication Date: 2018-05-08
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the usable compaction density of lithium iron phosphate on the market is mostly 2.1-2.3g / cm3, which restricts the energy density of the battery. The existing production process mostly uses multiple compaction and sintering, the manufacturing process is extremely complicated, and the production cost is high. The amplitude is increased, and the stability of the product batch is poor

Method used

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  • High-compaction-density lithium iron phosphate anode material and preparation method thereof
  • High-compaction-density lithium iron phosphate anode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] (1) By mixing pure water, iron phosphate, lithium source, carbon source and additives according to the mass ratio of 200:90:20:8:0.3, after grinding for 1.5 hours, a slurry with a particle size of 0.8 μm was obtained A;

[0032] (2) By mixing pure water, iron phosphate, lithium source, carbon source and additives according to the mass ratio of 200:90:20:8:0.3, after grinding for 4.5 hours, a slurry with a particle size of 0.2 μm was obtained B;

[0033] (3) Mix the slurries A and B according to the mass ratio of 3:7 to obtain the mixed slurry C, and then spray-dry the slurry C to obtain the lithium iron phosphate precursor powder D;

[0034] (4) Place the lithium iron phosphate precursor powder D in a nitrogen atmosphere furnace for heat treatment at a temperature of 650°C and a constant temperature time of 8 hours, and then air crush the semi-finished lithium iron phosphate powder obtained from the heat treatment to obtain a finished lithium iron phosphate product.

Embodiment 2

[0036] (1) By mixing pure water, iron phosphate, lithium source, carbon source and additives according to the mass ratio of 200:100:25:10:0.5, after grinding for 1.5 hours, a slurry with a particle size of 0.9 μm was obtained A;

[0037] (2) By mixing pure water, iron phosphate, lithium source, carbon source and additives according to the mass ratio of 200:100:25:10:0.5, after grinding for 4.5 hours, a slurry with a particle size of 0.3 μm was obtained B;

[0038] (3) Mix the slurries A and B according to the mass ratio of 3:7 to obtain the mixed slurry C, and then spray-dry the slurry C to obtain the lithium iron phosphate precursor powder D;

[0039] (4) Place the lithium iron phosphate precursor powder D in a nitrogen atmosphere furnace for heat treatment at a temperature of 700°C and a constant temperature of 10 hours, and then air crush the semi-finished lithium iron phosphate powder obtained by the heat treatment to obtain a finished lithium iron phosphate product.

Embodiment 3

[0041] (1) By mixing pure water, iron phosphate, lithium source, carbon source and additives according to the mass ratio of 200:110:30:13:1.0, after grinding for 1.5 hours, a slurry with a particle size of 1.0 μm was obtained A;

[0042] (2) By mixing pure water, iron phosphate, lithium source, carbon source and additives according to the mass ratio of 200:100:25:10:0.5, after grinding for 4.5 hours, a slurry with a particle size of 0.4 μm was obtained B;

[0043] (3) Mix the slurries A and B according to the mass ratio of 3:7 to obtain the mixed slurry C, and then spray-dry the slurry C to obtain the lithium iron phosphate precursor powder D;

[0044] (4) Place the lithium iron phosphate precursor powder D in a nitrogen atmosphere furnace for heat treatment at a temperature of 750°C and a constant temperature time of 12 hours, and then air crush the semi-finished lithium iron phosphate powder obtained by the heat treatment to obtain a finished lithium iron phosphate product....

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Abstract

The invention discloses a high-compaction-density lithium iron phosphate anode material and a preparation method thereof. Sizing agents of two different particles are selected, the large-particle sizing agent and the small-particle sizing agent are mixed according to a certain ratio in the grinding stage, then, drying treatment and thermal treatment are performed to obtain high-compaction-densitylithium iron phosphate, the obtained lithium iron phosphate is large in density, the preparation technological process is simple, the cost is low, the material can be applied to industrial mass production, automatic control is achieved, the finished lithium iron phosphate is good in performance, resources are saved, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a high compacted density lithium iron phosphate cathode material and a preparation method thereof. Background technique [0002] The compaction density has a great influence on the battery performance, and the compaction density is closely related to the sheet specific capacity, efficiency, internal resistance, and battery cycle performance. Generally speaking, the greater the compaction density, the higher the capacity of the battery can be made, so the compaction density is also regarded as one of the reference indicators for the energy density of the material. Under certain process conditions, the greater the compaction density, the higher the compaction density. The higher the capacity of the battery. At present, the usable compaction density of lithium iron phosphate on the market is mostly 2.1-2.3g / cm3, which restricts the energy density of the battery. The...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 王长伟商士波李东南胡泽林
Owner 桑顿新能源科技(长沙)有限公司
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